draver



(No Model.)

E. R. DRAVBR. SIFIING APPARATUS.

Patented Dec. 10,1895.

j?? @92?02, .viii/wapen UNITED STATES PATENT UEEicE.,

EML R. DRAVER, OE ALLIANCE, NEBRASKA, ASSIGNOR TO FLORENCE N.

DRAVER, OF SAME PLAGE.

SIFTING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 551,308, dated December 10, 1895.

Serial No. 516,627. (No model.)

To @ZZ whom, it may concern:

Be it known that l, EMIL R. DRAVER, a citizen of the United States, residing at Alliance, inthe county of Boxbutte and State of Nebraska, have invented a new and useful. lmproveinent in Sifting Apparatus, of which the 'following is a specification.

My invention relates to au improvement in apparatus which l have particularly designed for sifting use in connection with iiouronills, though it may be useful. in other connections for its sifting function.

Referring to the accompanying drawings, Figure l is a cross-sectional view of a sifting apparatus involving myimprovcment in its preferred form, and 2 is a broken plan view of thc screen device employed. in the construction represented by Fig. l..

A is a frame, shown as rectangular and as containing, between its sides, a hopper B emptying into a trough C, divided by a central longitudinal partition r into two coinpartments, each containing a rotary worin conveyer C', which may be driven by suitable connections (not shown) with the driving mechanism of the screen device, hereinafter described.

D is the screen device, comprising a frame q, shown as of rectangular form and divided longitudinally along its center into two sections p and p by a partition o, fastened to the under side of aV atwise-disposed center plate n, extending from one end of the frame to the other, though the partition o extends short of one end ofthe frame. Each of the sections p and p has its bottom formed of screening fabric fm, such as silk, fastened, according to the representation in Eig. l, along its outer edge to the lower corresponding edge of the frame, and along its opposite edge at or near the junction of the partition o with the plate n. Thus the screen-cloth inclines upward along its inner edge, and forms with the plate fn and partition a pocket Z tapering toward the partition. As will thus be seen the plate n affords, as it were, a shield overhanging the screen over which it is caused to extend to form therewith a tapering pocket.

The frame q is flexibly suspended, as by rods t, from the top of the frame A, at or near the center of the opposite ends of the frame q, and at or near the center of the plate n is a socket 7o into which enters the crank-pin e" of the head lL' on a rotary shaft i?, suitably journaled in vertical position and carrying at its upper end a beveled gear Vith the gear there meshes a similar gear h3 on a horizontal rotary drive-shaft 7e, journaled in suitable bearings on the top of the frame A and carrying an eccentric h' having a linkconnection h2 with one edge of the screenframe q, preferably at or near its longitudinal center.

The operation of the construction thus` dcscribed is as follows: The material to be sifted is fed, say, to the section p at the end of, as through a hopper, (not showin) and by the rotation of. the shaft h the crank i'. imparts to the frame q an nndulatory motion, which tends to spread the material upon the screen m of that section and crowd it into the tapering pocket Z thereof, from which it is forced out by the motion of the screen-frame. In each revolution of the shaft 7i, by the eccentric connection and the incidental .jarring action ofthe latter,the working of the material on the screen may be enhanced, though this eccentric connection is dispensable. Thus the material is propelled along the screen of Section p and passes about the end of the partition o into the section p', when the tilting and jarring action of the eccentric connection, if provided, is the reverse of that imparted to the material in the section p, the sifting motion tending to expel the material from the adjacent pocket Z and strew it over the screen-surface, at the end of which the tailings discharge, the sifted product dropping, throughout the operation, into the trough C, from which the conveyors C' lead it off.

The sifting effect of the apparatus thus described is very thorough and rapid.

Obviously any number of the screen devices D may be provided, one below the other and connected together, all to be actuated by the one crank on the uppermost, and of course such series of screens should be separated by horizontal partitions and 4may be arranged to discharge one into the other at thpir ends;

'but such an arrangement is not new with IOO other screens, and is too obvious to require illustration in connection with my improved screen construction.

That I Claim as new, and desire to secure by Letters Patent, is-

l. In a sifting-apparatus the combination With the `iframe of a Screen sloping from one side of the fra-me and a shield overhanging one edge of the screen and forming therewith a tapering pocket, substantially as and for the purpose set forth.

2. In a, sifting-appznatus, the combination of L frame, at partition dividing the freine lon gitudinally into eompartmen ts and extending Short of one end of the frame, screens in the compartments, sloping,` toward the partition from its opposite sides, Said partition having EMIL R. DRA'VER.

In presence of- GHARLES F. CARLETON, Il. C. DRAVER. 

